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to go in front of or beside someone or something in order to show them the way or to make them go in a particular direction
to play before everyone else
to use a particular card as one's first card in a game
to be someone's reason for doing or thinking something
a heavy soft metal, used in making bullets, in plumbing and roofing, especially in the past
a role or position of guiding or influencing others by setting an example or taking the initiative
an advantage held by a competitor in a race
the angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile)
the first card played by a player at the beginning of a trick, which sets the suit for that trick and determines the order in which other players must play their cards
a jumper that consists of a short piece of wire
the timing of ignition relative to the position of the piston in an internal-combustion engine